<!DOCTYPE html>
<html>
<head>
	<title>任务四：定位和居中问题</title>
	<meta charset="utf-8">
	<link rel="stylesheet" type="text/css" href="test4.css">
</head>
<body>
	<div class="container">
		<div class="box">
			<div class="box1"></div>
			<div class="box2"></div>
		</div>
	</div>
</body>
</html>